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	<h2> 提交记录 503 </h2>
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					<th class="col-xs-2"> 用户 </th>
					<th class="col-xs-3"> 题目 </th>
					<th class="col-xs-2"> 状态 </th>
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					<th class="col-xs-1"> 用时 </th>
					<th class="col-xs-1"> 内存 </th>
					<th class="col-xs-1"> 语言 </th>
					<th class="col-xs-1"> 代码长度 </th>
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					<td style='font-size:13px'> <a href='/user/profile/orbitingfIea/index.html'> orbitingfIea </a> </td>
<td> <a href='/problem/1002/index.html'> 1002. 测测你的多项式乘法 </a> </td>
<td> Accepted </td>
<td> 100 </td>
<td style='font-size:13px'> 1.264 s </td>
<td style='font-size:13px'> 31 MB + 680 KB </td>
<td style='font-size:13px'> C </td>
<td style='font-size:13px'> 1.53 KB </td>
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					<th class="col-xs-6"> 提交时间 </th>
					<th class="col-xs-6"> 评测时间 </th>
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					<td style='font-size:13px'> 2018-06-20 14:20:05 </td>
<td style='font-size:13px'> 2019-01-18 22:07:52 </td>
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				<label for="code"> 代码 </label>
				<pre style="background-color:white"><code class="cpp">
#define ll long long
#define rint register int
#define swap(x,y) x^=y^=x^=y

  const int mod=469762049, gen=3;
  
  ll K(ll x,int y){
    ll t=1;
    for (;y;y&gt;&gt;=1,x=x*x%mod) if (y&amp;1) t=t*x%mod;
    return t;
  }
  inline int up(int x){
    return x&gt;=mod? x-mod: x;
  }
  inline int dn(int x){
    return x&lt;0? x+mod: x;
  }
 
  int dp[2101000];
  void fft(int *a,int n){
    dp[0]=0;
    int i, j, b;
    for (i=1;i&lt;(1&lt;&lt;n);++i){
      dp[i]= j= i&amp;1? dp[i-1]+(1&lt;&lt;n&gt;&gt;1): dp[i&gt;&gt;1]&gt;&gt;1;
      if (i&lt;j) swap(a[i],a[j]);
    }
    for (b=0;b&lt;n;++b){
      int len1=1&lt;&lt;b, len2=1&lt;&lt;b+1, w0=K(gen,(mod-1)/len2);
      for (i=0;i&lt;(1&lt;&lt;n);i+=len2){
        int *l=a+i, *r=a+i+len1; int w=1, tmp;
        for (j=0;j&lt;len1;++j){
          tmp=(ll)w*r[j]%mod;
          r[j]=dn(l[j]-tmp);
          l[j]=up(l[j]+tmp);
          w=(ll)w*w0%mod;
        }
      }
    }
  }
 
  void realmain(int *a,int *b,int la,int lb){
    ++la, ++lb; int len=la+lb;
    int n=0, i, j; for (;len&gt;(1&lt;&lt;n);) ++n;
    for (i=la;i&lt;(1&lt;&lt;n);++i) a[i]=0;
    for (i=lb;i&lt;(1&lt;&lt;n);++i) b[i]=0;
    fft(a,n); fft(b,n);
    for (i=0;i&lt;(1&lt;&lt;n);++i) a[i]=(ll)a[i]*b[i]%mod;
    //reverse(a+1,a+(1&lt;&lt;n));
    for (i=1;;++i){
    	j=(1&lt;&lt;n)-i;
		if (i&lt;j) swap(a[i],a[j]);
		else break;	
    }
    
    fft(a,n); ll inv=K(1&lt;&lt;n,mod-2);
    for (i=0;i&lt;(1&lt;&lt;n);++i) a[i]=(ll)a[i]*inv%mod;
  }

int A[2101000], B[2101000];

void poly_multiply(unsigned *a, int n, unsigned *b, int m, unsigned *c)
{
	int i;
	for (i=0;i&lt;=n;++i) A[i]=a[i];
	for (i=0;i&lt;=m;++i) B[i]=b[i];
	realmain(A,B,n,m);
	for (i=0;i&lt;=n+m;++i) c[i]=A[i];
}</code></pre>
				<br />
				
				<label for="result"> 评测结果 </label><div class="row"><div class="col-xs-12"><div class="alert alert-success"><div class="text-center row"><table class="table table-borderless" style="margin:0px"><tr><td class="col-xs-2" style="vertical-align:middle;padding-left:20px;padding-right:20px"><b>Compilation</b></td><td class="col-xs-2" style="vertical-align:middle">N/A</td><td class="col-xs-2" style="vertical-align:middle">N/A</td><td class="col-xs-2" style="vertical-align:middle">Compile OK</td><td class="col-xs-2" style="vertical-align:middle">Score: N/A</td><td class="col-xs-2" style="vertical-align:middle"><a data-toggle="collapse" href="#detail_1" aria-expanded="false" aria-controls="detail_1">显示更多</a></td></tr></table></div><div class="collapse" id="detail_1"><br /><textarea class="form-control" style="background-color: white" rows="8" readonly>Compiling...
Compile success!
</textarea></div></div><div class="alert alert-success"><div class="text-center row"><table class="table table-borderless" style="margin:0px"><tr><td class="col-xs-2" style="vertical-align:middle;padding-left:20px;padding-right:20px"><b>Testcase #1</b></td><td class="col-xs-2" style="vertical-align:middle">1.264 s</td><td class="col-xs-2" style="vertical-align:middle">31 MB + 680 KB</td><td class="col-xs-2" style="vertical-align:middle">Accepted</td><td class="col-xs-2" style="vertical-align:middle">Score: 100</td><td class="col-xs-2" style="vertical-align:middle"><a data-toggle="collapse" href="#detail_2" aria-expanded="false" aria-controls="detail_2">显示更多</a></td></tr></table></div><div class="collapse" id="detail_2"><br /><textarea class="form-control" style="background-color: white" rows="8" readonly>verdict = Run Finished
time_ms = 1264.208682
mem_kb = 32424
Correct Answer
</textarea></div></div></div></div>
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